During the last years the problem of a correct dimension of broad pennants along an artificial coast has interested different researchers and technical operators. We indicate as broad pennant a structure perpendicular to the coast utilized in the nourishment. An important work of nourishment has been made near Venice, north of Italy, along Cavallino beach in the North Adriatic Sea, between the mouth of the Sile River and the beach of Venice's Lido. The artificial protection of the beach consists on 31 broad pennants, dividing in an equal number of cells the length of the beach. We have used the Cavallino beach with this project configuration as at at full-scale scenario.
Usually the approach used to dimension the broad pennants, and indicated in the Shore Protection Manual edition 1984, suggests a distance between structures equal to 2–3 times their length. The problem is that approach does not take (procedure no take) into account the particular characteristic both of sea state and of wave climate on the beach. In this report we analyse the influence of the dimension of the broad pennants on nourishment.
The final goal of this research was the definition of a parameter able to indicate the optimal size and dimension of transversal structure along an artificial coast, after nourishment, referring specifically to the particular wave climate of the area of interest.
The study was carried out along the Cavallino beach in the North Adriatic Sea and it will be considered as a model full-scale showing in time a different behaviour along its extension.
In total the area analysed is long 13 km. The artificial protection of the beach consists on 31 broad pennants, dividing in an equal number of cells the length of the beach.